Add 21/56 and 12/81
21/56 + 12/81 is 113/216.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 81 is 4536
Next, find the equivalent fraction of both fractional numbers with denominator 4536 - For the 1st fraction, since 56 × 81 = 4536,
21/56 = 21 × 81/56 × 81 = 1701/4536 - Likewise, for the 2nd fraction, since 81 × 56 = 4536,
12/81 = 12 × 56/81 × 56 = 672/4536 - Add the two like fractions:
1701/4536 + 672/4536 = 1701 + 672/4536 = 2373/4536 - 2373/4536 simplified gives 113/216
- So, 21/56 + 12/81 = 113/216
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/56+12/81 21/56+24/81 63/56+12/81 21/56+36/81 21/56+60/81 21/56+84/81